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为了探索微波等离子推力器谐振腔内电介质隔板对腔内电磁场及谐振频率的影响规律 ,用时域有限差分法 (FDTD)和离散Fourier变换 (DFT)法 ,对内有隔板、谐振模式为TM0 11模的谐振腔电磁场及谐振频率进行了数值分析。计算结果表明 ,隔板的存在不但使腔内轴向电场强度减小 ,而且使腔的谐振频率向低频方向偏移。隔板厚度愈厚 ,引起的轴向电场强度的减小和频偏愈大。这些结论为谐振腔隔板的设计、选材 ,以及谐振腔的设计和调谐提供了理论依据
In order to explore the influence of the dielectric barrier in the cavity of the microwave plasma thruster on the electromagnetic field and resonant frequency in the cavity, the finite difference time-domain (FDTD) and discrete Fourier transform (DFT) 11 mode resonant cavity electromagnetic field and resonant frequency of the numerical analysis. The calculation results show that the presence of the separator not only reduces the axial electric field in the cavity, but also causes the resonant frequency of the cavity to shift to the lower frequency. The thicker the separator, the smaller the axial electric field intensity and the larger the frequency offset. These conclusions provide the theoretical basis for the design and material selection of the resonator diaphragm and the design and tuning of the resonator